Service terminator



Sept. 28, 1943. R. w. SMITH SERVICE TERMINATOR Filed Feb. 2s, 1940 5 Sheets-Sheet 1 Sept 28, 1943. R, w, sMlTH SERVICE TERMINATOR Filed Feb. 23, 1940 5 Sheets-Sheet 2 Sept. 28, 1943. R. w. sMrrH SERVICE TERMINATOR Filed Feb. 2s, 194e 5 Sheets-Sheet 5 HEIM;-

Sept. 28, 1943. R. w. SMITH SERVICE TERMINATOR Filed Feb. 2s, 194.0

5 Sheets-Sheet 4 14j?. ro.

Swan/who@ Rum WA )WE SM1 TH Patented Sept. 28, 1943 UNITED STATES PATENT OFFICE 2,330,390 i SERVICE TERMiNAToR Rulo Wayne Smith, Auburn, Ind. Application February 23, l1940, Serial No. 320,498

3 Claims.

This invention relates to meter service terminators.

The primary purpose of the invention is to provide a device capable of being used in combination with water, gas or electric meters which will discontinue or interrupt the meter service upon the non-payment of the gas, water or electric service charge.

A further object of the invention is to provide a supply cut-off in combination with a metering system having a clock controlled means for disrupting the service unless the prescribed service charge 'is paid within a predetermined time lapse.

A still further object of the invention is to provide a clockand coin controlled switch mechanism capable of operation as a unit to terminate the supply service and to provide means for the collector of the water, gas or electric service charge to set the service terminator to disrupt the supply upon non-payment of the service charge after a predetermined number of elapsed hours from the time of the presentation of the bill.

One of the major problems that has presented itself to public utility corporations is the control of their delinquent accounts. This situation is rendered particularly acute in that the public service company does not know to what extent the subscriber is indebted nor does the subscriber know the amount of the service charge for a period of time until the rendition of the usual monthly bill. Inasmuch as utility companies usually extend an additional 15 or 30 day grace period before the subscriber is classed as a delinquent, the subscriber has consumed nearly another months service before the utility company can ascertain whether the original months service charge is to terminate in a delinquency. The above practice is objectionable and is overcome by providing a service terminator having a coin and time controlled switch mechanism which may be pre-set by the utility collector to cut off the supply at a predetermined time unless the exact amount of the` service charge is deposited within the terminator.`

Other objects and advantages of the invention will become apparent during the course of the following,1 description of the accompanying drawings, wherein:

Figure 1 is a side elevational View of a preferred embodiment of the invention, showing the manually set pointer for determining thev number of a single denomination coin required to prevent interruption of the service supply,

Figure 2 is a horizontal cross sectional View taken on line 2 2 of Figure l, looking in the direction of the arrows, illustrating the coin control device,

Figure 3 is a side elevational View, partly broken away to show the coin controlled switch mechanismin its neutral position,

Figure 4 is a side elevational view similar to Figure 3, illustrating the coin controlled switch mechanism in operation,

Figure 4a isa horizontal cross-sectional View taken on line ia-4a of Figure 4, looking in the direction of the arrows, illustrating in detail, the manner of slidably connecting the removable casing to the mechanism housing,

Figure 5 is a horizontal cross-sectional View taken on line 5-5 of Figure 3, looking in the direction of the arrows, showing the time operated trip mechanism,

Figure 6 is a vertical cross-sectional view taken on line 8-6 of` Figure 3, looking in the direction of the arrows illustrating in detail the coin operated step-by-step ratchet mechanism,

Figure 7 is a similar view showing the switch ln an open position after being tripped by the time controlled slide,

Figure 8 is a vertical cross-sectional view taken on line 8-8 of Figure 3 illustrating the time controlled trip and its associated parts,

Figure 9 is a perspective view of switch mechanism, illustrating the latch trip and the stepby-step delaying mechanism,

Figure 10 is a side elevational View of a modined form of the invention showing a portion of the casing broken away to disclose the operating parts, y Figure 11 is a vertical cross sectional view taken on line I I-H of Figure l0, further disclosing the coin controlled step-by-step operating mechanism,

Figure l2 kis a detailed perspective view of switch mechanism and the modified ratchet coin operator,

Figure 13 is a side elevational view of a further modified form of the invention employing a solenoid operated coin mechanism,

Figure 14 is a horizontal, fragmentary crosssectional view showing the circuit wiring and operating instrumentalities of the form of the invention shown in Figure 13, and

Figure l5 is a front elevational view of the operating lmechanism shown removed from the casing.

Figs. 16 and 1'7 are perspective and sectional views, respectively, of the coin slide.

- bars i-l connect the vertical ,chassis Jle In the drawings, wherein for the vpurpose of illustrating theinvention and wherein like reference characters will be employed to designate like parts throughout the same, in Figures l to 9, inclusive, the reference character I will be employed to generally designate a housing including an upper section l2 capable of being supported on a Wall W 'adjacent the service meter and a removable bottom section I4. The lower portion ciY tlnefhousingl secioniiiis open andl is provided'with a grooved'edge i6 for receiving the upper edge of the housing section ld. An ex'- tension i8 is formed on one wall of the upper section i2 and has its vertical edgesfg-Bf over@ turned for receiving oppositely extending iianges 22 on one of the Walls oi the lowericasi-ng sec-.5

tion Ill. A ferrule bushingy iZitis formed, in one wall of the casing section I2 for admitting electric cables and the front wall is provided-With l a .concaue Jcupp ed ..pcrtion 25 having., a hinged cover.. lid 2B. for ,protecting the ,operating knob dia, c'oin mechanism. plunger which will be more fully hereinafter described,`

Extending `rinwardlydrom the cllppd portion 26 is 'al squared tube" 3,. having reciprocablymountedtherei'n, aa sliding .plunger 32; on 'the outer ,end of, which is provided aknob 3 4. The plungerafis formedwitha slot 35, curved at the a platform lli, as at l5, and said platform coinprises a pair of vertical standards 'EG between which extends a rock shaft i3. At one end of the rock shaft, there is provided a coil spring Si! having one end connected to the platform and the opposite end connected to a lever arm S2 secured to the rock shaft.

Also secured to the rock shaft 1S are oppositely extending arms 3A and 85 and the arm 8A is bent angularlyfon its free end. for engagement with a trip pin SS carried on a ratchet wheel 9%.

The ratchet wheel El] is rigidly secured to one end of an 'arbor @2 which is journaled in a tubular extension Sil supported by a vertical standard closed end, at 38, 'andhaving oppositely directed, lugs!! riding ini elongated slotsforined in the side walls of the squaredcoin. tube 39;

A coinof .a certain denomination may beinserted inthe *vrounded portion ofgthe slot 36, as

at 3B; 'when -the plunger'32'is withdrawn'beyond the cup shapedcavity'andgtheplunger may then be movedinwardiy until theedge of the coin engages a slidingbar42'alsofreciprocably mountedin the square-d' tube4 3G." The-inner end of the sliding bar 4 2 is provided with a cut-away portion Y of--vfhioh are sup'portedby a block 52 secured -in place, by screws, 5t extending through the Ai cricalmbars 553 and anChQFe'dinthe block 52.-' SecurefttoA the "lower endv of Vthel barsis `a pair ci parallel bars liconnected at their'outer ends b3.' a horizontalbar 58., Also `exteijidng upwardly from. the horizontal bar ES is 'apair of jbar s'tfll connected-at 'thectop bya bart. Parallel "side bars @il to th'e-ven'ticalv suspensinnbars, 5 y "C Secured-- to one ci the lovvermost" hassis `bars 5t is a downwardly extending rod 13B, havingthe extreme-free end-threaded; as Vat "53, for receiv- Ilngf-a locl'r'lacarried by the' bottom Wall of the lower` casing section ifi. Anka/"l2 may be ployed for operating Jthe i-ocktlito releasefi-he lower casing 'section--i'l so-gthat it maybe r enicved inspecting -the -pa-rts 'of the terminator, collecting coins and setting the terminator at meter reading'times. j"f "'3. I' 'L 1 Bolted tothe chassis frame above described is 9% carried by the chassis bar 56. ,n Mounted on the arbor 92 is a collar a pointer. iiiadapted to cooperatewith a stationary dial c2 secured to the chassis ira he bar by means of a screw i061. Also mounted on the arbor 92 at the opposite end thereof is a rock lever itt, the upper end of which is connectedto the reciprocating slide bar t2 bya pivot pirol. Intermediatethe ends oftherock lever iili' is apivoted pawll it adapted to engage teethud i2 iorined'fonthe peripheryroi ratchet wheel Qi) tio-cause-Ythe wheelto-revclve onelnotch upon rocking movement of` the 1ockileverl!l6.- Graduations lill on the dial w2-are-marled in aocordanceiwithrthe number. of notches formed in' the ratchet Wheel/so that the pointer Ult may lev willl be rockeda corresponding; number of before returning vtliepointer dollz-to zero which will position theytriplpin inisucha positionto .engage the reci; shaft A pivoted pawl ttt has, one, endpresenteditQ- the ratchet teeth I l2 and the, opposite .rend iS.--iQiVQtl1y Carriedby a; suspended support i i8 mounted on the sisbar Sii;-

l for eiecting each advancement and whenthe trip-pin 88 .engages theirockerm ithe rockarm ca -Twill vmove downwardly 7and will niov,e away tremila contact arm L20 whicbhaaits .other end anehored;V asY at l.22,. to. .a n :insulatingfblogck IVM. Also carried by the insulating.block..l2 .is a stationarycontact member vvvLZon the endof rwhich isprovide cl a.. contact I2iadaptedvtoengage a Contact`- 13B 'carriediby the free movablerend. of the-: contactrlever?|l2l. 1n;Figure ofthe rock arm gis shown in aposition'to `hold theY Contact pointsy closed .whi-lein Eigure 'Lthe `eontactpoints areshown Sciliar-ated.v V Sirjicethe movablecontact anni! ZPS-is normally: .urged downwardly the rocking;. inovement applied tothe-Arockgshalft .78 ,by the rockA arm 84 engaging ,the trip pin. 88 l,williallow the contacts to closeandthetrip lpin ca iis in this position after the coinpperatefd mechanism has shifted the ratchet wheel ,gbythe insertion oiaseries of coins :to advancethe pointenirorn one of the set graduations on the,d ialll2f. to Zero. `iithe triopinfiit is out of engagement with the rock arm 84, the rock amr owill-be Inoveduph Wardly under. the. tensionof theplne ,t.,. there byseparating the `coritzictsnlz and [33, and breaking theircuttherethrough Slidably mounted upon the extreniehupper ends o fhthevertical standards i6 is a slide bar @3.2 having elongated slots ,lorreceivins bolts .|35- T h e slide4 bar` L32 isdir'eotly above the `rock arm and isadapted to hold the rock arniin a lowermost position when the slide bar |32 isat the end of one of its sliding positions. A notch |38 etat oneiof the graduationsdandthe rock is formed in the slide bar and is adapted to receive the rock arm v8|'when the slide bar is in its opposite extreme position to allow the rock arm 86 to move upwardly when the rock arm 84 is disengaged from the trip pin 38, thereby allowing the contact arm |20 to move upwardly and separate the contacts |28 and |30.

Means is provided for shifting the slide bar in timed relation and includes a clock mechanism |40 carried by the inner wall of the upper casing section |2, having an alarm arbor |42 provided with a crank arm |44 adapted to have its free end engage a pin |46 carried oncne of the free ends of the slide bar |32. f

It will thus be seen, that when the pointer has been set to one of the graduations ||4, as for instance 8, shown in Figure 1, that it will be necessary to insert 8 coins to operate the slide bar 42 and advance the ratchet wheel A90 so that the trip pin 88 will be moved to engage the rock arm 84 when the pointer has moved to the zero mark on the graduated scale. In this position the contacts will be maintained closed irrespective of the position of the slide bar |32. However, should the coins not be inserted after the device has been set by the inspector or collector, the slide bar |32 will shift after a predetermined time limit thereby allowing the rock arm 86 to move upwardly in the notch |38. When the rock arm 86 is moved upwardly, the contacts |28 and |32 are separated thereby breaking the circuit through cables |50 and |52 connectedto the contact arms |20 and |26, respectively, on opposite sides of the insulator block |24. A post |54has one of its ends secured to the platform 14 While the upper end supports the insulating block |24.

The terminator device can be used for closing a circuit through a solenoid operated valve to cause the valve to cut off the supply of gas or water entering a building for any purpose. However, the cables |50 and |52 are connected in series with an electric meter |54 and the cable |50 is attached to one of the current supply lines |56 while the cable |52 is attached to the meter |54. The other side of the supply line |58 is connected to the meter by a lead line |60. liead lines |62 and |64 connect with the meter |54 for supplying current to various electric appliances such as electric lights etc. representing aload |66.

For a consideration of the operation of the device, it will be supposed that the inspector of theutility company calls to read the meter |54. If he nds that the subscriber has used two dollars worth of current, the inspector is instructed to insert 8 coins which will total the amount of the bill. The inspector of the utility company will set the pointer |00 to one of the graduations on the dial |02 in accordance with the number of coins totaling the cost of the current consumed. The slide clock arm |32 will be set so that the rock arm 86 is out of alignment with the notch |38 therein. If the coins are not inserted to advance the ratchet wheel so that the trip pin 08 is brought under the rock arm 84, the clock mechanism will operate the slide bar |32 after a predetermined number of hours thereby moving the notch therein directly above the rock arm 86 and allowing the same to shift upwardly engaging the movable contact arm and separating the contacts |28 and |30. After the contacts have been separated the current supply from the lines |56 and |58 is broken to the load |58. ',Io reestablish the circuit, it is necessary thatthe subscriber insert the required number of coins which will ad- Vance the ratchet wheel 90 and trip pin 88 thereon under the rock arm 84 causing the downward movement of the rock arm 86 and allowing the spring contact arm |20 to move downwardly and close the circuit through the contacts |28 and |30.

In the modied form of the invention shown ln Figures 10 to 12, inclusive, the construction of the casing is identical to the form of the invention shown in Figures 1 to 9, inclusive, and oomprises 4sections |10 and |12 which may be positioned against a wall or other supporting surface. The lower edge of the upper section |10 is provided with a grooved sealing member |14 and the upper casing section is extended downwardly as at |16 to protect and form a slide guideway for the lower section when the same is displaced.

A chassis is suspended from the upper section |10 and includes a pair of parallel supporting bars |18 having their upper ends rigidly attached to the upper casing section |10. A pair of lower chassis bars are connected at right angles to the lower ends of the frame bars |18 and the free ends are connected to vertical standards |82. Horizontal frame bars |84 connect the vertical standards |82 to the chassis supporting bars |18.

Secured to the vertical standards |82 is a platform |86 having upstanding frame bars |88 arranged in spaced relation. Pivotally mounted between the frame bars |88 is a rock shaft |00 having an arm |52 to which one end of a coil spring |94 is secured. The opposite end of the coil spring is anchored to the platform |05. Also carried by the rock shaft |80 is a pair of oppositely extending arms |08 and |88 and the arm |80 is adapted to engage the curved free end of a movable contact member 200 anchored to an insulating block 202, as at 204.

A stationary contact arm 20G has its free end terminating short of the movable contact arm and the opposite end is connected to the insulating block 202 by means of a screw or the like 208. The insulating block 202 is supported on the upper end of a frame bar 2! 0 carried by the platform |86.

A time controlled slide bar 2|2 is mounted for sliding movement on the upper ends of the upstanding bars |88 and is provided adjacent the ends thereof with elongated slots 2|4 in which are received guide bolts 2|6. A notch 2|8 is cut in one edge of the slide bar 252 and is adapted to register with the rock arm |33 when the slide bar is shifted by means of suitable clock mechanism engaging the pin 220,

The above mechanism operates to open and close contacts 222 and 224 carried by the contact arms 200 and 200 in substantially the same manner as the form of the invention shown -in Figures l to 9, inclusive, and to hold the contacts in a closed position to prevent the current passing through the cables 225 and 228 from being interrupted, a coin controlled mechanism including a coin tube 230 having a slide 232 is provided in the upper casing section |10 and is substantially identical to the coin tube mechanism 80 shown in Figures 1 to 9, inclusive. The coin controlled mechanism is operable from a manual operating member located under the hinged cover 234 pivotally attached to the upper casing section as at 236, f

A rock leve-r 233 has its upper end pivctally secured to the coin operated slide 232, as at 248., and the lower end ci the rock lever is connected to a pin 242 carried by a suspended support 244 attendeer tereiter entes-is renie teil" :bei

Arr ex-L asien* ses reformed inte-gretiwfitn ne A rexek Bair rarissime-lily' n'leuntedin' fai-tubular by' ne www meditations .262 are .provid-'d en the reel; bei opposite' nie facie teethv :ed w en graduations correspond to those upon the dial W2 d ifscloseci in Figures 1 to 9 inclusive.

. Y,S'-1`1fi .iQ niet@ of., Marlowe? .Chassis frar' here vatis- ,a eewgvfar'euyexteneirigred 2st, ure lower v which;istlireadediornbeing received in'a okl carried by the floor of the casing e'c on i12.

ities io te r2. rechtswege substantially iden 4een tothat shown in Figures 1` to 9g inclusive, with the' -eric"erjotitn that the coin controlled mecha-y operates' arack bar 2 5!) to engagethe rock ein itefirit'steeu @operating the r'etehe't 'Wheel f ist to rn've the trip underthe rock arrri gli. It will thu-s be obvious that the subscriber win ce required t5 mserttne designated number 'comete' effect e cerrespnuiij-g number er rocking rnyerrie'ntsto the roclg lever 233 the flsvlieat. ,stl-.byrsteb adi/mme@ 0f. th ijaekpepzp te move the upper end 25e im@ en; gagerne'nt with the rock |96. In the event that the designated nur nber of coins are riot inserted, the slide bar lE will inove so that the not ch 2 8i s Aregistry with the rock arm |93, thereby, allowingthe contact arrn Elli? to niovef upwardly and break Athe circuit Ythrough the babies attendees, The cables 226 and 223 inay connect with a solenoid pperated valveinterposed in a supply line 4or they may interrupt the circuitthrough the electric current supply.

in Figures 13 to. 15, inclusive, theinvention comfjn'ses e easing en the inner wen er Winch is provided a pair of chassis frame bars22 connected to parallellower chassisbars 2M which extend to the opposite wallZ'lEiv of the casing and areconnected to a coin chute 218 which is formed of ibroid or suitable insulating material. The wall Z'lbis oiiset from the wall 21!) to forrn an opening 280 for receiving coins which slide down-` wardly 'between plates 282 and 234 spaced by end separators 286. Carried by one of the end separators 286 is a circuit closer including a contact member 238 anchored to abushing 2953 held in place by a machine screw 292. The free end of the 'contact 233 extends into the coin chute passage 273 'and is adapted to engage a coin passing thro'u'ghvthe chute so that the coin will inovve the Contact arin into 'engagement with a ct arrn 29a supported by a bushing 256 anchored in place by a screw 298.

The contact 288 is connected to a solenoid y3M by a lead z'while the opposite 'contact 254 is connected to thefpow'er line 366 by neans of a 'leed une tot, A ieee une ses 'connects the 'einer newer une are te 'the solenoid stt thereby ecmopV ion of the invention shown i In the 'Ino'diiied forno of the invention shown zio plting circl'iitPtli'ugli'n the s'olnloi'd upon'A the insertion' o'f a coin in; the' slot 2F83. `An armature :#.lzf is provided tnesolenoid' an'd projects through; a supporting strap 3M3 carried bly the coiri slot sidebar-rs' 236?. Mounted on the armature 31 2 is" a discsliaped cushion'h Si@ for absorbing shocks during the" rnove'rne'nt of the armature and? securedto' the'- extreme free end.- of thel ar'ratur is acollar' having arr upstandingarnr 329 extended inwardly, as at 322, thel end of which terninatesinal gear wheel' ven"- gaging dog 32'4. n

Also supported by the solenoid strap 314 is an oblique arrn 3% to which is secured atubular bushing 328 forrotatively receiving' an arbor 336. On one end of thefarbo there is provided a gear' wheel 332', Vwhile the opposite end is' adaptedto receive a collar 336. Formed on the4 collar 334is apoiter 33S adapted to'v cooperate with a sca-le 338 l'iziv'i'ng p'eripl'ieral graduations 3M.

A dog 32d is presented to the gear wheel 3-3'2 and when it engages the teeth thereon, advances the wheel in a rotary nanne'rl A pivote'd detei'it 342 is also adapted to engage' the teeth the gear wheel 332 to prevent backward moi/erneut thereof and Said d'tt is pivote-ily carried `by an oblique arni 354 anchored o1'i the arn 3255 and is pivotally supported or'i a pin 346 around which is wound e' `een spring' ses; one end being en-y c'horedto the ariii 344, while the` other end erigegee the aetenjt 342 te heid they sante against the teeth of the 'gear wheel 332.

- A trip pin'll is secured to the gear wheel 332 and is'adapte'd'td engage a rock arrn 352 carried by a rocli shaft 354 rotatively mounted between vertical posts 356 mounted on a platiorm 35B securely fastened to the coin slot posts Extending o-ppositely fro'r the rock arm 352 is a rock arm 360, also carried by the rock shaft and the free end thereof is adapted to engage a movable Contact member 362 anchored to an insulating block 3554. An arni 365 is secured to' the rock shaft 354 and is provided with a coil spring 36S to normally urge the rock arm 360 upwardly Mounted on the insulating block 364 is a con tactvarm Si@ directly under the Contact arm 362 so that the respective contacts 312 and 3M will engage and close a circuit through respec-v tive lead lines 376 and 318.

One of the lead lines 31S is connected to the power line 306 while the other lead line 37E is connected to the electric meter 388.

A lead-line 382 connects the other power line 3m with the meter 38B and lead lines 38A connect the meter 330 to the load 385-.

lThe operation of the fern-1 of the invention shown-in Figures 13 to 1-5, inclusive, is similar to the operation of the forms shown in Figures l to 12, inclusive, except that the gear wheel 332 is rotated by theimpulses imposed on the solenoid Stil upon closing of the circuit therethrough by the insertion of e @ein in the slet zet which en gages the movable Contact 288 which rnoves the armature 312 and advances the gear wheel 332 a single notch.

sneebiy mounted entire upper ends of the posts 35e isa slide'bar388 yhaving a notch at one end for receiving the rock arm 3:56 when ythe slide bar wais moved by suitable clock mechanism (not shown) engaging "a 'pin :SSL

n will bereauiiy uriei'erstoedtnet the utility company col-lectornay the pointer :33% -with respect to the dial 338 in the same manner as is shown in Figures 1 to 9, inclusive, and that after a predetermined number of coins have been inserted in the coin chute 280, that the trip pin 351] will come to rest directly under the rock arm 352 and prevent its downward movement after the clock mechanism has shifted the slide bar 38S to bring the notch therein directly in alignment with the rock arm 360. Should the subscriber fail to insert the required number of coins, the clock mechanism will shift the slide bar 388 and allow the upward movement of the spring contact arm 362 thereby separating the contacts 312 and 314 with the resultant breaking of the circuit through the meter 38D.

It is to be understood, that the forms of the invention herewith shown and described are to be taken as preferred embodiments thereof and that various changes in the shape, size and arrangement of parts may be resorted to without departmg from the spirit of the invention or the scope of the subjoined claims.

What is claimed is:

1. A service terminator comprising a pair of normally closed cooperating electrical contact members, a rocker shaft having a pair of pins projecting therefrom, one of said pins being adapted to actuate one of the cooperating contacts for disengaging the same and opening a circuit, resilient means associated with the rocker shaft for affecting this movement, a coin set cletent adapted to engage the other pin in a predetermined position to prevent rotation of the rocker shaft and the disengagement of the Contact member, and a clock operated elongated latch bar having a notch therein which notch in a predetermined position of the latch bar receives the last named pin upon release by the detent to open the cooperating electrical contact member.

2. A service terminator comprising a pair of normally closed cooperating electrical contact members, a rocker shaft having a pair of oppositely disposed pins thereon, one of said pins being adapted to move one of the contacts for disengaging the same from its cooperating contact, resilient means associated with the rocker shaft normally tending to rotate the rocker shaft in a direction for the pin to disengage the contact, a coin set detent adapted to be moved into the path of the other pin in a predetermined position to prevent the rotation of the rocker shaft and the disengagement of the cooperating electrical contacts, and a clock operated elongated latch bar having an edge portion adapted to engage the iirst named pin and prevent the opening of the Contact members after the detent has released the last named pin, said latch bar having a recess therein for receiving the rst named pin to open the cooperating electrical contact members.

3. A service terminator comprising a pair of resilient normally closed cooperating electrical Contact members, a rocker shaft having means thereon normally urging one of said Contact members to an open position with respect to the other, a coin set detent adapted to engage means on the rocker shaft at a predetermined position of the coin set detent for preventing the opening of the contact members, and a latch bar actuated by a clock mechanism in predetermined positions of the latch bar cooperating with the first named means of the rocker shaft for preventing opening of the contact member and having a recess therein thereby upon the means being received in the recess permitting cf the opening of the contacts by said means.

RULO WAYNE SMITH. 

